CONNECTION SOCKET FOR A SUBMERSIBLE ELECTRIC MOTOR

PRISE DE BANCHEMENT POUR MOTEUR ELECTRIQUE SUBMERSIBLE

English Abstract

Abstract of the Disclosure
A connection socket for a submersible electric motor
includes a connection box of the motor provided with two
plates, one of which holds connection pins. The other plate is
arranged to divide the connection box into two sealed rooms to
prevent liquid coming into the box along the electrical cable
from going further into the motor.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A connection socket in a connection box for a submersible
electric motor comprising in combination:
a first upper plate having a plurality of first mounting
holes;
a second lower plate having a plurality of second mounting
holes;
a first upper insulated holder mounted in one of said
plurality of first holes;
a second lower insulated holder mounted in one of said
plurality of second holes;
a connection pin, one end being mounted in said first
insulated holder and another end being mounted in said second
insulated holder, said one end having first connection means for
connecting to incoming conductors, and said connection pin having
second connection means adjacent said other end and positioned
between said first and second plates for connecting to conductors
from the electric motor;
said connection pin having adjacent said one end a
peripheral groove for retaining a sealing ring between said pin
and said first holder;
said first upper insulated holder having peripheral
groove for retaining another sealing ring between said first upper
insulated holder and said first upper plate, whereby liquid is
prevented from entering the chamber formed by said first and second
plate from said one end of said connection pin.




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Description

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72432-24
This invention concerns a connection socket for an
electric connection to a submersible electric motor or generator.
Connection soc]cets for this purpose are, especially with
big machines, made of an insulated plate provided with a number of
pins for the electric conductors which are cast wi-thin the plate.
At the underside of the plate, the connectors from the electric
motor are attached. On the other side of the plate the conductors
from a motor cable are connected. The pins are arranged in a water-
proof manner in the insulated plate and the latter is in its turn
waterproof-mounted in the wall of the connection box. In this way
two independent wa-terproof-insulated chambers are obtained which
means that incoming liquid in the upper chamber is prevented from
entering the lower chamber and into the motor.
When mounting -the plate, the conductors at the underside
are first connected to the pins and then the plate is mounted.
This means that the conductors at -the underside must be relatively
long to make -the mounting possible. When the plate thereafter is
mounted the conductors are packed under the plate and may be
squeezed or bent undesirably thus damaging the insulation.
Summary of the Invention
The disadvantages of the prior art are overcome by means
of the present invention which provides a connection socket in a
connection box for a submersible electric motor comprising in com-
bination: a first upper plate having a plurality of first mounting
holes; a second lower plate having a plurality of second mounting
holes; a first upper insulated holder mounted in one of said
plurality of firs-t holes; a second lower insulated holder mounted
in one of said plurality of second holes; a connection pin, one end

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72432-24
beiny moun-ted in said first insulated holder and another end being
mounted in said second insulated holder, said one end having first
connection means for connecting to incoming conductors, and said
connection pin having second connection rneans adjacent said other
end and positioned between said first and second plates fox connect-
ing to conductors from the electric motor; said connection pin hav-
ing adjacent said one end a peripheral groove for retaining a seal-
ing ring between said pin and said first holder; said first upper
insulated holder having peripheral groove for retaining another
sealing ring between said first upper insulated holder and said
first upper plate, whereby liquid is prevented from entering the
chamber formed by said first and second plate from said one end of
said connection pin.
Above-mentioned and other features of this invention
will become more apparent by reference to the following description
taken in conjunction with the accompanying drawings, in which:
Figure 1 shows a device according to the invention seen
from above; and
Figure 2 shows a vertical section of a part of the device.
In the drawings a connection pin 1 has a hole 2 for a
conductor. A lower plate 3 has insulated holders 4 for the pin 1.
There are also shown an upper plate 5, another insulated holder 6
and o-rings 7 and 8.
According to the invention the mentioned isolated plate
is replaced by two plates 3 and 5. The lower plate 3 is put on its
place and the pins 1 are mounted on the plate by help of a holder
4. The plate 3 and the holder 4 now serve to stabilize the pins
during the mounting. The conductors 11 from the electric motor

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which are brought up through the plate 3 are connected to the pins
1 by means of holes 2 in any sui-table soldering cr mechanical
manner. Superfluous ends are cut and the conductors are so
arranged that there is no risk of squeezing or bending. Then the
upper plate 5 is brought downwardly over the pins, the holes in
the plate ~eing somewhat wider than the pins to facilitate the
mounting. A supporting and sealing socket 6 of insulating material
is brought downwardly over each pin and is connected to the plate
5 by serews. In order to secure a perfeet sealing, O-rings 7 and
8 respeetively are arranyed between the pin 1 and the holder 6 and
between the holder 6 and the plate 5. Sinee the holder 6 is made
of insulating material the plate 5 may be manufaetured in some
other material sueh as cast-iron.
The plate 5 is then sealingly attached to the connection
box and an entirely waterproof dividing of the housing has now
been obtained. The connection oE incoming conductors to the upper
parts of the pins 1 is made by connection means 9 in the usual
soldering or meehanieal manner.
The big advantage with the deviee aeeording to the inven-

tion is thus that all eonneetions and mountings may be made underfull control and there is no risk of squeezing or bending of the
conductors.
While above the principles of my invention are described
in connection with specific apparatus, it is to be clearly under-
stood that this description is made only by way of example and not
as a limitation to the scope of the invention as set forth in the
accompanying claims.